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Hi

I would like to use your library to implement the key-exchange part of MSE/PE. The spec requires P:

 0xFFFFFFFFFFFFFFFFC90FDAA22168C234C4C6628B80DC1CD129024E088A67CC74020BBEA63B139B22514A08798E3404DDEF9519B3CD3A431B302B0A6DF25F14374FE1356D6D51C245E485B576625E7EC6F44C42E9A63A36210000000000090563

And G = 2.

I could easily add a groupId #3 for the purpose but I see that you seem to be aiming for increasing length primes with your different cases.

Could you please suggest to me a way to add this group to your library in clean way, that fits your thinking, and without breaking backwards compatibility. If you tell me how you think it should be done, I will happily do it and submit a pull request.

Best,

Nicholas

Can you add a License to this project?

Greetings!

I am having trouble understanding how I supply a private key that is not newly created, e.g. created in a previous command. In short, I need to create key pairs in one command and perform secret key derivation in another command.

As the example:

package main

import (
	"github.com/monnand/dhkx"
	"flag"
	"fmt"
	"math/big"
)

var (
	key       = flag.String("key", "", "Private key.")
	pub       = flag.String("pub", "", "Public key.")
	gen       = flag.Bool("gen", false, "Generate asymmetric keypair.")
	derive    = flag.Bool("derive", false, "Derive shared secret key.")
)

func main() {
	flag.Parse()

	g, _ := dhkx.GetGroup(14)

	if *gen {
		// Generate a private key from the group.
		// Use the default random number generator.
		priv, _ := g.GeneratePrivateKey(nil)

		fmt.Printf("Private= %v\n", priv)

		// Get the public key from the private key.
		pub := priv.Bytes()

		fmt.Printf("Public= %x\n", pub)
	}

	if *derive {
		PubKey := dhkx.NewPublicKey([]byte(*pub))

		fmt.Printf("PubKey: %v\n", PubKey)

		// Compute the key
		k, _ := g.ComputeKey(PubKey, *dhkx.DHKey(*key))

		// Get the key in the form of []byte
		key := k.Bytes()
		fmt.Printf("Key: %x\n", key)
	}
}

But I don't understood how to transform the parameter provieded by flag in to dhkx.DHKey:

.\main.go:42:43: cannot convert *key (type string) to type dhkx.DHKey

How to inform the private key?

Thanks in advance!